Grinding machine



REED 5; 1924. F. E. GARDNER GRINDING MACHINE Filed July 28 1919 3 Sheets-Sheet l Feb. 5

F. E. GARDNER GRINDING MACHINE Filed July 28 1919 3' Sheets-Sheet 2 M. 5, 1924; 3,482,465 F. E. GARDNER GRINDING MACHINE Filed July 28, 1919 s Sheets-Sheet 5 Patented Feb. 5, 1924.

UNITED STATES FREDERIC E. GARDNER, OF BELOIT, WISCONSIN.

GRINDING MACHINE.

Application filed July 28,

T all whom it may concern.

Be it known that I, FREnERio E. GARDNER, a citizen of the United States, residing at Beloit, in the county of Rock and State of Wisconsin, have invented certain new and useful Improvements in Grinding Machines, of which the following is a specification.

My invention relates to grinding machines and more specifically to those known as disk grinders, in which the work is supported on a movable table and pressed against the face of a rotating disk. In devices of this class both the pressure of the work against the disk and the feeding of the work across the face of the disk are usually done by hand. In handlingwork of rather large size the power necessary to feed the work across the face of the disk is considerable and seriously limits the amount of work that can be handled by a single workman. One object of my invention is to provide a worksup porting table which may be manually pressed toward the face of the grinding disk and fed across said face by power.

If a device of this character is arranged to automatically reverse the feed when the work has traveled across the face of the disk, no attention on the part of the workman is necessary and he is apt to leave the work on the machine much longer than isnecessary to finish it. Anobject of my device is to arrange the power feed for the table so that the workman must reverse it periodically by hand, which reversal will require his constant attention so that he will be anxious to finish the grinding operation as soon as possible.

Further objects and advantages of my in vention will become apparent as the description proceeds.

In the accompanying drawings Figure 1 is a side elevation of a grinding machine showing the preferred embodiment of my invention. Fig. 2 is an end view of the machine; and Fig. 3 is a plan view of the work table and adjacent parts.

In the embodiment of my invention selected for illustration a main spindle 1O journaled in suitable hearings in a column or base 11 carries a grinding disk 12 at its front end and at its other end has a set of cone pulleys 18 which deliver power to a' belt 14 driving cone pulleys 15 on the end of the back shaft 16. I have shown a casing 17 covering a suitableelectric motor for 1919. Serial No. 313,668.

driving the spindle 10, which, in this instance, constitutes the armature shaft of the motor. Any other suitable means for driving the spindle may obviously be employed.

A knee 18 is vertically slidable on guide- 60 ways 19 on the column 11 and may be raised and lowered by a suitable screw 20 engaging a suitable threaded member 21 mounted on the foot 22 projecting from the column '11. The screw 20 may be manually operated by means of a hand wheel 23 on the shaft 24 connected to said screw by beveled gears 25. The knee 18 supports a carriage 26 slidable toward and away from the grind ing disk on ways 27 and the carriage 26 supports the work table 28 slidable on ways 29 parallel to the face of the grinding disk.

Means are provided for sliding. the carriage toward and away from the disk 12 comprising a hand lever 30 adapted to ro tate a vertical shaft 31 journaled in suitable bearings on said carriage and carrying a gear 32 meshing with a stationary rack 33 mounted on the knee 18. It will be seen that pushing the hand lever 30 toward the disk 12 will force the carriage in the same direction and that the lever arm afforded by the gear is relatively short so that a rela tively large force can be easily exerted on the work. Means is provided for limiting 85 the motion of the carriage 26 toward the disk 12. I have illustrated an'adjustable stop screw 34 threaded through the vertically projecting lug 35 mounted on the knee 18, said screw being adapted to engage a lug- 36 at the endof the carriage 26 and limit. the motion of the carriage toward the disk Means for transmitting power to the work table 28 to feed it across the face of the disk includes two pulleys indicated at 87 in dotted lines in Figs. 1 and 2, driven in op posite directions by belts 38 from pulleys on the back shaft 16. The pulleys 37 are mounted on a horizontally extending shaft 39 and manual means is provided for clutch- 1 ing either pulley 37 to the shaft 39. I ha e shown a clutch dog 10 adapted to'be moved in either direction to engage either clutch by a hand lever -41 at the upper end of a vertical shaft 42 extending past and suit- 105 ably connected to said clutch dog. An additional hand lever 13 under the end of the carriage 26 is also provided. The horizontal shaft 14: supported in suitable bearings t5 mounted on the base 22' and column 11 car no ries this hand lever and is connected to the vertical shaft 4 by means of suitable beveled gears 46.

Means for transmitting power from the shaft 39 to the table 28 comprises a vertical shaft 47 mounted in fixed bearing in th column 11 and carrying a long multithreaded worm 48. A horizontal shaft 49 carried by the knee 18has a worm wheel 50 at its inner end engaging the worm 48. It will be seen that the knee may be raised and lowered without interfering with the transmission of power through this connection as the worm wheel will. merely roll along the side of the worm to a new position when the knee is raised or lowered.

A horizontally extending shaft 51 carried by the knee is driven from the shaft 4-9 by suitable gears 52. The carriage 26 car ies abevel gear 53 rotatably mounted on a epending lug 54 on said carriage and splined to rotate with the shaft 51. A vertical shaft 55 mounted in the carriage 26 receives power from the gear 53 by a suitable bevel. gear, and at its upper end carries a spur gear meshing with a rack 56 fastened to the work table 28. It will be seen that power may be transmitted to the work table ..8 from th shaft 16 in any position of the table. The rack 56 may slide out of engagement with the' pinion in either direction without run-- ning the table 28 off the guideways 29 but if the work is fed too far by the workman and passes the edge of the disk, the lever 30 will yield suddenly to his pressure and tend to arouse him.

A suitable hood 57 may enclose the upper portion of the grinding disk 12 and a suitable pump 58 may be employed to supply Water or other lubricant to the grinding disk from a tank 59. In operating my device the knee is first adjusted to a suitable height for the work in hand and prefe ably a suitable work holder 60 is attached to the work table 28. The work 61 is inserted between the holder 60 and the face of the disk, forced forward against the disk by pressure on the lever 30 and fed back and forth across the face of the disk by either the lever 41 or the lever 43 which must be operated intermittently at short intervals to reverse directionof motion of the work table 28. The workman may stand at the end. of the carriage'and lean against the pressure lever 30, preferably pushing on it with his felt hand while his right hand reaches down to operate the reversing lever 43; or he may stand at the end of the work table 28 and pull on the pressure lever 30 inwhich case the reversing lever 41 is in a convenient position for his left hand. An electric switch 62 is mounted in a convenient position on the side of the column llandarranged to control the motor for drivingithe spindle 10 Vi hile I have shown and described in de tail a preferred embodiment of my device, it should be distinctly understood that the disclosure is illustrative only and that many variations and modifications will naturally occur to those skilled in the art. I aim to protect all such legitimate modification in the subjoined claims.

I claim as my invention:

1. A grinding machine having, in combination, a column, a slidable knee on said column, a Work carrier inountedon said knee, an elongated.- worm in said column extending parallel to the direction of sliding motion of said knee, a rotatable shaft in said knee, a worm wheel on saidshaft meshing with said worm in all positions of said knee, and a connection between said rotatable shaft and said work carrier for moving the latter with respect to said knee.

2. A grinding machine having, in combination, a base, agrinding element thereon, a vertically adjustable knee on said base, a reciproca tory work table mounted on said knee, and means for driving said work table comprising a drive shaft. carried by said base, a vertically disposed worm supported by saidbase adjacent to said knee and driven from said shaft, a horizontal shaft mounted in said knee, a worm Wheel on said horizontal shaft meshing with said worm, a connection between said horizontal shaft and said work table for reciprocating the latter, and means for reversing the direction of rotation of said drive shaft.

3; A grinding machine'having, in combination, a base, a" grinding element mounted thereon, a knee mounted on said base, a reciprocatory work table supported by said knee and means for reciprocatin said table comprising a driving shaft carried by said base, a pair of driving elements loosely mounted on said shaft, a clutch element slidable but non-rotatable on said shaft and arranged to alternately engage said drive elements, a' driving connection between said shaft and said work table, and two hand levers one located alongside said base behind said work table and the other located in front of said work table, said hand levers being operatively connected to said" clutch element for shifting the latter.

4-. A grinding machii'ie having, in combination, a base, a grinding element mounted thereon, a knee vertically slidable on saidbase, a support slidable on said knee toward and away from said grinding element, means for sliding said support, a' work table slidable on said support in a direction perpencli'cular to the direction of sliding movement of said support, a rack barfixed to said work table, a vertical shaft mounted in said support' and having a pinion meshing with said rack bar, a vertically disposed worm supported by said base adjacent" to said knee, a horizontal shaft mounted in said knee and having a worm wheel meshing with said worm, a driving connection between said horizontal shaft and said vertical shaft and mechanism for driving and reversing said worm.

5. A grinding machine having, in combination, an operating element, a movable work table adjacent the face of said operating ele-- ment, a column supporting said operating element and work table, a reversing clutch adjacent the base of said column, a control shaft for said clutch extending upwardly beside said column, and a second control shaft geared to said first-mentioned control shaft extending horizontally forward under said work table. 4

6. A machine of the character described having, in combination, a column, a movable work table, manual means for moving said work table toward and away from said column, power means for moving said work table across the face of said column, a single manually operated element forming part of said manual means, and a plurality of manually operated control elements for said power means located in different positions,

said first-mentioned manually operated element being easily reached from any of said positions.

7. A machine of the character described having, in combination, a column, a movable Work table, a single manually operated ele ment adapted to control the motion of said work table toward and away from said column, and a plurality of manually operated elements located in different positions, each adapted to control the motion of said work table across the face of said column and each located in a position from which said firstmentioned manually operated element may be readily reached.

8. A grinding machine having, in combination, a column, an operating element carried by said column, a knee slidable on said column, a work table on said knee and adjacent the face of said element, a back shaft extending along one side of said column, a countershaft mounted in said column, a transmission connecting said shafts, and means for connecting said countershaft and said table for driving the latter across the face of said element for any position of said knee.

9. A grinding machine having, in combination, a column, an operating element carried by said column, a work table adjacent the face of said element, and reversible means for driving said work table, said means comprising a back shaft, a countershaft in said column, a connection between said countershaft and said table, two driving elements loosely mounted on said countershaft, means extending from said back shaft for driving said elements in opposite directions, and clutch means for alternately securing said driving elements to said oountershaft.

In testimony whereof, I have hereunto set my hand.

FRE-DERIC E. GARDNER. 

